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require File.join(File.dirname(__FILE__), '..', '..', 'spec_helper')
module ActiveRelation
describe Relation do
before do
@relation = Table.new(:users)
@attribute1 = @relation[:id]
@attribute2 = @relation[:name]
end
describe '[]' do
describe 'when given a', Range do
it "manufactures a range relation when given a range" do
@relation[1..2].should == Range.new(@relation, 1..2)
end
end
describe 'when given an', Attribute do
it "return the attribute congruent to the provided attribute" do
@relation[@attribute1].should == @attribute1
end
end
describe 'when given a', Symbol, String do
it "returns the attribute with the same name, if it exists" do
@relation[:id].should == @attribute1
@relation['id'].should == @attribute1
@relation[:does_not_exist].should be_nil
end
end
end
describe '#include?' do
it "manufactures an inclusion predicate" do
@relation.include?(@attribute1).should be_kind_of(RelationInclusion)
end
end
describe '#Expression?' do
it "returns false" do
@relation.should_not be_aggregation
end
end
describe 'read operations' do
describe 'joins' do
before do
@predicate = @relation[:id].equals(@relation[:id])
end
describe '#join' do
it "manufactures an inner join operation between those two relations" do
@relation.join(@relation).on(@predicate).should == Join.new("INNER JOIN", @relation, @relation, @predicate)
end
end
describe '#outer_join' do
it "manufactures a left outer join operation between those two relations" do
@relation.outer_join(@relation).on(@predicate).should == Join.new("LEFT OUTER JOIN", @relation, @relation, @predicate)
end
end
end
describe '#project' do
it "manufactures a projection relation" do
@relation.project(@attribute1, @attribute2).should == Projection.new(@relation, @attribute1, @attribute2)
end
end
describe '#as' do
it "manufactures an alias relation" do
@relation.as(:thucydides).should == Alias.new(@relation, :thucydides)
end
end
describe '#rename' do
it "manufactures a rename relation" do
@relation.rename(@attribute1, :users).should == Rename.new(@relation, @attribute1 => :users)
end
end
describe '#select' do
before do
@predicate = Equality.new(@attribute1, @attribute2)
end
it "manufactures a selection relation" do
@relation.select(@predicate).should == Selection.new(@relation, @predicate)
end
it "accepts arbitrary strings" do
@relation.select("arbitrary").should == Selection.new(@relation, "arbitrary")
end
end
describe '#order' do
it "manufactures an order relation" do
@relation.order(@attribute1, @attribute2).should == Order.new(@relation, @attribute1, @attribute2)
end
end
describe '#aggregate' do
it 'manufactures a group relation' do
@relation.aggregate(@expression1, @expression2).group(@attribute1, @attribute2). \
should == Aggregation.new(@relation, :expressions => [@expresion, @expression2], :groupings => [@attribute1, @attribute2])
end
end
end
describe 'write operations' do
describe '#delete' do
it 'manufactures a deletion relation' do
@relation.delete.should be_kind_of(Deletion)
end
end
describe '#insert' do
it 'manufactures an insertion relation' do
@relation.insert(record = {:id => 1}).should be_kind_of(Insertion)
end
end
end
end
end
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